器件名称: W144
功能描述: 440BX AGPset Spread Spectrum Frequency Synthesizer
文件大小: 201.42KB 共13页
简 介:W144
440BX AGPset Spread Spectrum Frequency Synthesizer
Features
Maximized electromagnetic interference (EMI) suppression using Cypress’ Spread Spectrum technology Single chip system frequency synthesizer for Intel 440BX AGPset Two copies of CPU output Six copies of PCI output 1 One 48 MHz output for USB One 24 MHz output for SIO Two buffered reference outputs One IOAPIC output Thirteen SDRAM outputs provide support for three DIMMs Supports frequencies up to 150 MHz I2C interface for programming Power management control inputs Table 1. Pin Selectable Frequency FS3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 Input Address CPU_F, CPU1 FS2 FS1 FS0 (MHz) PCI_F, 1:5 (MHz) 1 1 1 133.6 33.4 (CPU/4) 1 1 0 124 31 (CPU/4) 1 0 1 150 37.5 (CPU/4) 1 0 0 140 35 (CPU/4) 0 1 1 105 35 (CPU/3) 0 1 0 110 36.7 (CPU/3) 0 0 1 115 38.3 (CPU/3) 0 0 0 120 40 (CPU/3) 1 1 1 100.2 33.4 (CPU/3) 1 1 0 133.3 44.43 (CPU/3) 1 0 1 112 37.3 (CPU/3) 1 0 0 103 34.3 (CPU/3) 0 1 1 66.8 33.4 (CPU/2) 0 1 0 83.3 41.7 (CPU/2) 0 0 1 75 37.5 (CPU/2) 0 0 0 124 41.3 (CPU/3)
Logic Block Diagram
VDDQ3 REF0/(PCI_STOP#) X1 X2 XTAL OSC
PLL Ref Freq
Pin Configuration [1]
REF1/FS2 VDDQ2 IOAPIC VDDQ2
I/O Pin Control
Stop Clock Control
CLK_STOP#
PLL 1
÷2,3,4
Stop Clock Control
CPU1 CPU_F VDDQ3 PCI_F/MODE PCI1/FS3 PCI2 PCI3 PCI4 PCI5 VDDQ3 48MHz/FS0
÷2
Stop Clock Control
SDATA SCLK
I2C Logic PLL2
VDDQ3 REF0/(PCI_STOP#) GND X1 X2 VDDQ3 PCI_F/MODE **PCI1/FS3 GND PCI2 PCI3 PCI4 PCI5 VDDQ3 SDRAMIN GND SDRAM11 SDRAM10 VDDQ3 S……
